package com.hmall.gateway.filters;

import cn.hutool.core.text.AntPathMatcher;
import com.hmall.common.exception.UnauthorizedException;
import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.util.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;


import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

@Component
@RequiredArgsConstructor
public class AuthGlobalFilter implements GlobalFilter, Ordered {

    private final AuthProperties authProperties;

    private  final JwtTool jwtTool;
    private final AntPathMatcher antPathMatcher = new AntPathMatcher();

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取用户信息
        ServerHttpRequest request =  exchange.getRequest();
        //2.判断是否需要做登录拦截
        if(isExclude(request.getPath().toString())){
            //放行
            return  chain.filter(exchange);
        }
        //3.获取token
        String token = null;
        List<String> headers= request.getHeaders().get("authorization");
        if(headers != null && !headers.isEmpty())
        {
            token = headers.get(0);
        }
        //4.校验并解析token
        Long userId = null;
        try{
            userId = jwtTool.parseToken(token);
        } catch (UnauthorizedException e){
             //拦截，设置响应状态码为401
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();

        }
        //5. 传递用户信息
        System.out.println("userId = " + userId);
        String userInfo = userId.toString();

        // 传递给下游服务器
        ServerWebExchange swe= exchange.mutate()
                .request(builder -> builder.header("user-info", userInfo))
                .build();
        // 6.放行
        return chain.filter(swe);

    }

    public boolean isExclude(String path){
        for(String pathPattern : authProperties.getExcludePaths()){
          if(antPathMatcher.match(pathPattern,path)){
                return  true;
            }
        }
      return false;
    }
    @Override
    public int getOrder() {
        return 1;
    }
}
